Bone Implant Ridge Structure for Rotational Fragment Stability
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Solution Overview
Problem
Maintaining proper re-alignment and re-attachment of fractured bone fragments in their original anatomic locations during the healing process is difficult due to rotational forces exerted by surrounding muscles, particularly in shoulder joint injuries.
Innovation Solution
The bone implant features a raised ridge structure with posterior, anterior, and superior ridge portions that project away from the exterior surface, providing stabilization by preventing rotational movement of bone fragments through abutment surfaces and continuous or discrete apex lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional bone implants without ridge structures are used, then the implant structure is simple, but the bone fragments cannot maintain proper anatomic orientations due to rotational forces from muscles
Solution Approach 1:
The ridge structure is divided into multiple segments including a superior ridge portion, a posterior ridge portion, and an anterior ridge portion. Each ridge portion is positioned to prevent rotation in specific directions, collectively providing comprehensive rotational stability against muscle forces while maintaining a modular design that addresses the stability-complexity contradiction.
Solution Approach 2:
The ridge structure extends in multiple spatial dimensions with the superior ridge portion projecting superiorly, the posterior ridge portion projecting posteriorly, and the anterior ridge portion projecting anteriorly. This multi-dimensional configuration creates a three-dimensional constraint system that prevents rotational movement in all directions, transforming a simple linear structure into a comprehensive spatial stabilization system.
2Reliability
If a raised ridge structure with multiple ridge portions is added to prevent rotational movement, then rotational stability is improved, but the implant structure becomes more complex
Solution Approach 1:
Each ridge portion is designed with specific local characteristics tailored to its functional requirement. The superior ridge portion has a first configuration optimized for preventing superior-inferior rotation, the posterior ridge portion has a second configuration for preventing posterior-anterior rotation, and the anterior ridge portion has a third configuration for preventing anterior-posterior rotation. This localized optimization provides high reliability for each directional constraint while keeping each individual ridge portion relatively simple.
Solution Approach 2:
The ridge structure employs asymmetric design where the superior, posterior, and anterior ridge portions have different configurations and orientations. This asymmetry allows each ridge portion to specifically address rotational forces from different muscle groups, providing superior rotational stability while avoiding the need for a uniformly complex structure throughout the entire implant.
Data Source
AI summary
A compression fastener may include a shaft and a helical thread disposed about the shaft. The shaft may include a proximal end, a distal end, a proximal shaft portion, and a distal shaft portion. The helical thread may include at least one concave undercut surface and a plurality of pitches that may include at least one first pitch along the proximal shaft portion and at least one second pitch along the distal shaft portion. The at least one concave undercut surface may be angled towards one of the proximal end and the distal end of the shaft, and the at least one first pitch and the at least one second pitch may not be equal to each other.